What contains libgnat?

[Rico Secada]

Hi

I was trying to install the Business Shell (BUSH) from ports.

I got the following error on FreeBSD 6.1 stable:

checking for gcc w/Ada (with gnatgcc)... yes
checking for libgnat (ldconfig -p, Linux)... no
checking for libgnat (ldconfig -r, FreeBSD)... no
No version of the Ada Run-Time Environment (libgnat) was found
If you have installed libgnat, you may need to use ldconfig (as
root) to update the shared library search paths for libgnat

BUSH requires one of the following:
   GCC 3.x with Ada enabled
   ACT's GNAT 3.14 or newer
===>  Script "configure" failed unexpectedly.
Please report the problem to ports at FreeBSD.org [maintainer] and attach the
"/usr/ports/shells/bush/work/bush-1.0.3/config.log" including the output of
the failure of your make command. Also, it might be a good idea to provide
an overview of all packages installed on your system (e.g. an `ls
/var/db/pkg`).
*** Error code 1

Stop in /usr/ports/shells/bush.

I googled but couldn't find what I was searching for.

How do I install libgnat?

Best and kind regards.
Rico.